This looks like a way for Riot to avoid criticism.
Maybe this is just the conspiracy theorist in me. Then again, in the year 2013, it seems perfectly valid to be a conspiracy theorist (I mean these words are probably going to be stored at a Prism facility by the NSA if that tells you anything).
With this style of posting, threads with problems that more casual players would be interested in (like the removal of IP from custom games thread) would become invisible quickly, since the majority of the players that do care about that kind of stuff usually don't visit the forums anyway.
Here is a link: http://forums.na.leagueoflegends.com/board/showthread.php?t=3832701
I sometimes feel like the forum's voice of the voiceless, and its hard for me to keep threads with more casual concerns relevant, with this system it will be all but impossible.
You may not like seeing so many posts that are nothing more than "bump" but if it makes a thread visual again, then it is necessary. How can someone make a thread relevant that isn't important to the average forum user? Just because it isn't relevant to the average forum user doesn't mean that it isn't relevant to the player base at large.
If they decide to fully implement this reddit style system over the old vbulletin, then I pray they have some way to reach out to the more casual non forum going players. The players that when they have a problem with the game, they don't say anything and just leave. Those players that prefer to play a custom game with one or 2 friends over playing a PvP match. Those players that don't care anything about rankings. Those player who would rather see more maps and mode in the game than hear about professional teams. These are the types of players I represent, and there are much more of them then Riot seems to realize as evidence by the the thread linked above. These player's voices get buried in the old system, but by the looks of this one, may even seem non existent. A whisper is better than nothing.